A travel site to which I subscribe (Hotwire) notes that Spirit is having a one day fare sale..12 dollars one way from East coast aiports. Destinations include the Caribbean. Sale ends at 11:59 pm tonight (5-30-07). Because it arrived on my company e-mail , which I'm checking from home, I can't detail the terms and conditions which I'm sure apply. But it might be worth checking out. If you can get the details..might be worth posting the,
Disclaimer: I do not work for Spirit, nor do any friends or family.